2002 Tahoe LS with Autoride. Need to replace brake rotors & pads. To order rotors... need to kno if is limited slip differential. How do I I.D. if limited slip?

You might want to check your differential fluid. I think those vehicles have limited slip rearends in them. It might need some limited slip additive. I know it is a Chevy but Motorcraft limited slip additive is the best.

Fix is very vague - new pads? Usually $60 for the premium pads plus $50-60 for laber.

If the rotors need to be turned (I always recommend when replacing pads) usually $8-$10 to turn each rotor.

So, to add it all up, you'll spend around $125-$150 for a rear brake job. A part time handyman/mechanic could do it for less than a hundred.

There is a specific thickness a rotor needs to be to function properly. The minimum thickness is usually stamped on the rotor itself, sometimes on the edge and sometimes on the inside. If the rotor is warped,you need to have them "turned" on a brake lathe, or replaced. You will know if they are warped when you apply the brakes at a high speed,and the brake pedal moves up and down. As far as the rear end, or differential oil is concerned, when you remove the cover and re-silicone it, you fill it until it runs out of the filler hole. Check with your owners manual to see what kind of grease it takes,and if it takes an additive in case of a limited slip rear end.

it could, that should be the first thing you check. If its low, the brakes may need service. as the brakes wear it takes up fluid, and the pads may be worn to the limits.

sounds like your brake calipers are sticky. Did you clean and lube the slides on the calipers when you did the brake pad swap? If so you probably need new calipers.

Normal Maintenance Details
90,000 Miles (144,000 Kilometers) : All Applicable Models

INSPECT AUTOMATIC TRANSAXLE FLUID
INSPECT BALL JOINT & DUST COVERS
INSPECT BALL JOINTS
INSPECT BRAKE DISCS/ROTORS
INSPECT BRAKE DRUMS & LININGS
INSPECT BRAKE HOSES
INSPECT BRAKE LINE PIPES
INSPECT BRAKE PADS
INSPECT DIFFERENTIAL FLUID
INSPECT DRIVE BELTS
INSPECT DRIVESHAFT/PROPELLER SHAFT DUST BOOTS
INSPECT EXHAUST PIPES & MOUNTS
INSPECT FUEL LINES & CONNECTIONS
INSPECT FUEL SYSTEM
INSPECT FUEL TANK BAND
INSPECT FUEL TANK CAP GASKET
INSPECT FUEL VAPOR SYSTEM
INSPECT MANUAL TRANSAXLE FLUID
INSPECT STEERING GEAR/RACK
INSPECT STEERING LINKAGE
REPLACE AIR CLEANER/ELEMENT
REPLACE COOLANT
REPLACE ENGINE OIL
REPLACE ENGINE OIL FILTER
ROTATE TIRES

Here is a step by step DIY guide (with photos) from tdiclub.com.
These guys know your stuff. If you own a TDI you need to check out this site.

http://forums.tdiclub.com/showthread.php?t=77522&highlight=brake+diy

Before you consider replacing the calipers, try applying Anti-Squeal lube to the brake pads. You could just have dry brake noise.

there is a metal tag on the cover of the differential that will say limited lip if u have it.

new rotors and new brake pads ...
...full job would include loaded calipers with all new hardware ..if you pay attention to disassembly you will not need a service manual necessarly..all is logical and straightforward...but you are dealing with safety so be sure you are good before taking a drive ...good luck